iswblank - cppreference.com (original) (raw)

| | | | | --------------------------- | | ----------- | | int iswblank( wint_t ch ); | | (since C99) |

Checks if the given wide character is classified as blank character (that is, a whitespace character used to separate words in a sentence) by the current C locale. In the default C locale, only space (0x20) and horizontal tab (0x09) are blank characters.

[edit] Parameters

[edit] Return value

Non-zero value if the wide character is a blank character, zero otherwise.

[edit] Notes

ISO 30112 defines POSIX blank characters as Unicode characters U+0009, U+0020, U+1680, U+180E, U+2000..U+2006, U+2008, U+200A, U+205F, and U+3000.

[edit] Example

#include <locale.h> #include <stdio.h> #include <wchar.h> #include <wctype.h>   int main(void) { wchar_t c = L'\u3000'; // Ideographic space ('　') printf("In the default locale, iswblank(%#x) = %d\n", c, !!iswblank(c)); setlocale(LC_ALL, "en_US.utf8"); printf("In Unicode locale, iswblank(%#x) = %d\n", c, !!iswblank(c)); }

Output:

In the default locale, iswblank(0x3000) = 0 In Unicode locale, iswblank(0x3000) = 1

[edit] References

• C23 standard (ISO/IEC 9899:2024):

• 7.30.2.1.3 The iswblank function (p: TBD)

• C17 standard (ISO/IEC 9899:2018):

• 7.30.2.1.3 The iswblank function (p: TBD)

• C11 standard (ISO/IEC 9899:2011):

• 7.30.2.1.3 The iswblank function (p: 449)

• C99 standard (ISO/IEC 9899:1999):

• 7.25.2.1.3 The iswblank function (p: 395)

[edit] See also